Constant-temperature circulating water treatment system

Abstract

The invention discloses a constant temperature circulating water treatment system, and relates to the technical field of water treatment.The constant temperature circulating water treatment system comprises an ultrafiltration unit and a first heat exchange unit, the output end of the ultrafiltration unit is communicated with a reverse osmosis unit, the reverse osmosis unit is communicated with two output ends, the first input end of the first heat exchange unit is communicated with the output end of a primary treatment component, and the second input end of the first heat exchange unit is communicated with the output end of a secondary treatment component. The first output end of the first heat exchange unit is communicated with the output end of the ultrafiltration unit, the second input end of the first heat exchange unit is communicated with the first output end of the reverse osmosis unit, the second output end of the reverse osmosis unit is communicated with a first heat exchange mechanism, and the output end of the ultrafiltration unit is provided with a second heat exchange mechanism; multi-stage heat exchange is performed through the first heat exchange unit, the second heat exchange unit and the third heat exchange unit in sequence, so that cyclic utilization of heat is realized, sustainable development and utilization of energy are realized, and the problem that the membrane flux of the ultrafiltration unit and the reverse osmosis unit is remarkably reduced in a low-temperature environment is solved.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a constant temperature circulating water treatment system. Background Art

[0002] Environmental protection generally refers to the general term for various actions taken by human beings to solve real or potential environmental problems, coordinate the relationship between human beings and the environment, protect the living environment of human beings, and ensure the sustainable development of the economy and society. In order to prevent the deterioration of the natural environment and the protection of green mountains, green waters, blue skies, and the sea, this involves not illegally mining and deforestation, not discharging or releasing waste indiscriminately, not overgrazing, not over-opening up wasteland, not over-exploiting natural resources, not destroying the ecological balance of nature, etc. In urban life, in order to prevent the waste of resources, the discharged sewage needs to be recycled, filtered, cleaned, and reused to achieve the goal of saving resources.

[0003] In the process of circulating water treatment, sewage needs to be treated by ultrafiltration and reverse osmosis. Water is separated by membranes during ultrafiltration and reverse osmosis. When sewage is treated in some areas with lower temperatures, the temperature drops, causing the ultrafiltration and reverse osmosis membrane flux to drop significantly in the low temperature environment, resulting in the inability of ultrafiltration and reverse osmosis to operate, making it inconvenient to circulate water in a low temperature environment.

[0004] Based on this, a constant temperature circulating water treatment system is now provided, which can eliminate the disadvantages of the existing devices. Summary of the invention

[0005] The object of the present invention is to provide a constant temperature circulating water treatment system to solve the problem in the background art that it is inconvenient to perform ultrafiltration and reverse osmosis treatment on water in a low temperature environment.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A constant temperature circulating water treatment system comprises an ultrafiltration unit and a first heat exchange unit, wherein the output end of the ultrafiltration unit is connected to a reverse osmosis unit, and the reverse osmosis unit is connected to two output ends, the output liquid inside the ultrafiltration unit is raw water, the output liquid of the first output end of the reverse osmosis unit is purified water, and the output liquid of the second output end of the reverse osmosis unit is concentrated water, the ultrafiltration unit is composed of a booster pump, a membrane shell, and an ultrafiltration membrane, the reverse osmosis unit is composed of a booster pump, a membrane shell, and a reverse osmosis membrane, and the first input end of the first heat exchange unit is connected to the output end of the preliminary treatment component A heating component is connected between the output end of the preliminary treatment component and the first input end of the first heat exchange unit. The output liquid of the preliminary treatment component is raw water. The first output end of the first heat exchange unit is connected with the output end of the ultrafiltration unit. The second input end of the first heat exchange unit is connected with the first output end of the reverse osmosis unit. The second output end of the reverse osmosis unit is connected with a first heat exchange mechanism for transferring and cooling the concentrated water temperature. A second heat exchange mechanism for heating the raw water temperature inside the ultrafiltration unit is provided between the output end of the ultrafiltration unit and the first output end of the first heat exchange unit.

[0008] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0009] In an optional scheme: the first heat exchange mechanism includes a second heat exchange unit, the second output end of the reverse osmosis unit is connected to the first input end of the second heat exchange unit, the first output end of the second heat exchange unit is connected to a first drain pipe, the second output end of the first heat exchange unit is connected to a first output branch and a second output branch, and the first output branch is connected to the second input end of the second heat exchange unit.

[0010] In an optional scheme: the second heat exchange mechanism includes a third heat exchange unit, the first input end of the third heat exchange unit is connected to the first output end of the first heat exchange unit, the first output end of the third heat exchange unit is connected to the input end of the ultrafiltration unit, the second output end and the second output branch of the second heat exchange unit are both connected to the second input end of the third heat exchange unit, and the second output end of the third heat exchange unit is connected to a second drain pipe.

[0011] In an optional solution, the input ends and output ends of the ultrafiltration unit, the reverse osmosis unit, the first heat exchange unit, the second heat exchange unit and the third heat exchange unit are all provided with a pressure pump.

[0012] In an optional solution: the first heat exchange unit and the second heat exchange unit are one or more of a plate heat exchanger, a tube heat exchanger, a spiral plate heat exchanger, a shell and tube heat exchanger, and a shell and tube heat exchanger.

[0013] In an optional solution: the third heat exchange unit is one or more of a coupler with antifreeze glycol added and a water source heat pump, and a coupler with antifreeze glycol added and an air source heat pump.

[0014] In an optional scheme: the clean water flow rate at the second output end of the first heat exchange unit is equal to the sum of the clean water flow rate of the first output branch and the clean water flow rate of the second output branch, the raw water flow rate at the output end of the ultrafiltration unit is equal to the sum of the clean water flow rate at the first output end of the reverse osmosis unit and the concentrated water flow rate at the second output end, and the clean water flow rate of the first output branch is equal to the concentrated water flow rate at the first input end of the second heat exchange unit.

[0015] In an optional scheme: the raw water temperature at the first output end of the first heat exchange unit is greater than the raw water temperature at the first input end of the first heat exchange unit, the raw water temperature at the first input end of the third heat exchange unit is less than the raw water temperature at the ultrafiltration unit input end, the purified water temperature at the second input end of the first heat exchange unit is less than the purified water temperature at the second output end of the first heat exchange unit, the purified water temperature at the second input end of the second heat exchange unit is less than the purified water temperature at the second output end of the second heat exchange unit, the concentrated water temperature at the first input end of the second heat exchange unit is less than the concentrated water temperature at the first output end of the second heat exchange unit, and the purified water temperature at the second input end of the third heat exchange unit is greater than the purified water temperature at the output end of the third heat exchange unit.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention realizes the recycling of heat by performing multi-stage heat exchange through the first heat exchange unit, the second heat exchange unit and the third heat exchange unit in sequence, thereby achieving the sustainable development and utilization of energy, and solving the problem that the membrane flux of the ultrafiltration unit and the reverse osmosis unit decreases significantly under low temperature environments in most parts of the country, resulting in the inability to operate the ultrafiltration system and the reverse osmosis system. At the same time, it ensures the stable operation of the water treatment system and achieves low cost and high energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Notes on reference numerals: 11 ultrafiltration unit, 12 reverse osmosis unit, 13 first heat exchange unit, 14 second heat exchange unit, 15 third heat exchange unit. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] In one embodiment, Figure 1As shown, a constant temperature circulating water treatment system includes an ultrafiltration unit 11 and a first heat exchange unit 13, the output end of the ultrafiltration unit 11 is connected to a reverse osmosis unit 12, and the reverse osmosis unit 12 is connected to two output ends, the liquid outputted from the ultrafiltration unit 11 is raw water, the liquid outputted from the first output end of the reverse osmosis unit 12 is purified water, and the liquid outputted from the second output end of the reverse osmosis unit 12 is concentrated water, the ultrafiltration unit 11 is composed of a booster pump, a membrane shell, and an ultrafiltration membrane, the reverse osmosis unit 12 is composed of a booster pump, a membrane shell, and a reverse osmosis membrane, the first input end of the first heat exchange unit 13 is connected to the output end of the preliminary treatment component, a heating component is connected between the output end of the preliminary treatment component and the first input end of the first heat exchange unit 13, and the preliminary treatment component is connected to the first input end of the first heat exchange unit 13. The output liquid of the treatment component is raw water, the first output end of the first heat exchange unit 13 is connected with the output end of the ultrafiltration unit 11, the second input end of the first heat exchange unit 13 is connected with the first output end of the reverse osmosis unit 12, the second output end of the reverse osmosis unit 12 is connected with a first heat exchange mechanism for transferring and cooling the concentrated water temperature, and a second heat exchange mechanism for heating the raw water temperature inside the ultrafiltration unit 11 is provided between the output end of the ultrafiltration unit 11 and the first output end of the first heat exchange unit 13. The first heat exchange mechanism facilitates the transfer of the internal temperature of the concentrated water, thereby facilitating the cooling of the concentrated water temperature, and the second heat exchange mechanism facilitates the heating of the raw water entering the ultrafiltration unit 11, thereby preventing the membrane permeability of the ultrafiltration unit 11 and the reverse osmosis unit 12 from decreasing;

[0022] The first heat exchange mechanism includes a second heat exchange unit 14, the second output end of the reverse osmosis unit 12 is connected to the first input end of the second heat exchange unit 14, the first output end of the second heat exchange unit 14 is connected to a first drain pipe, the second output end of the first heat exchange unit 13 is connected to a first output branch and a second output branch, the first output branch is connected to the second input end of the second heat exchange unit 14, and the raw water flow rate of the first input end of the first heat exchange unit 13 is Qm 3 / h, the temperature is T1°C, the raw water flow rate at the first output end of the first heat exchange unit 13 is Qm 3 / h, the temperature is T2°C, and the clean water flow rate at the first output end of the reverse osmosis unit 12 is Q2m 3 / h, the temperature is T4°C, and the concentrated water flow rate at the second output end of the reverse osmosis unit 12 is Q4m 3 / h, the temperature is T4°C, the clean water flow rate at the second output end of the first heat exchange unit 13 is Q2m 3 / h, the temperature is T5℃, the clean water flow rate of the first output branch is Q1m 3 / h, the temperature is T5℃, and the second output quality water flow is Q3m 3 / h, the temperature is T5°C, the concentrated water flow rate at the first output end of the second heat exchange unit 14 is Q4m3 / h, the temperature is T9°C, and the clean water flow rate at the second output end of the second heat exchange unit 14 is Q1m 3 / h, temperature is T6℃.

[0023] The second heat exchange mechanism includes a third heat exchange unit 15, the first input end of the third heat exchange unit 15 is connected to the first output end of the first heat exchange unit 13, the first output end of the third heat exchange unit 15 is connected to the input end of the ultrafiltration unit 11, the second output end and the second output branch of the second heat exchange unit 14 are both connected to the second input end of the third heat exchange unit 15, the second output end of the third heat exchange unit 15 is connected to a second drain pipe, and the flow rate of the first input end of the third heat exchange unit 15 is Qm 3 / h, the temperature is T2°C, the flow rate at the first output end of the third heat exchange unit 15 is Qm 3 / h, the temperature is T3°C, the flow rate at the second input end of the third heat exchange unit 15 is Q2m 3 / h, the temperature is T7°C, the flow rate at the second output end of the third heat exchange unit 15 is Q2m 3 / h, the temperature is T8°C, the flow rate at the input end of the reverse osmosis unit 12 is Qm 3 / h, temperature is T3℃;

[0024] When water treatment is required, the raw water is transported to the inside of the first heat exchange unit 13 through the first input end of the first heat exchange unit 13 through the preliminary treatment component, and the raw water is heated by the heating component. At the same time, the reverse osmosis unit 12 transports the purified water to the inside of the first heat exchange unit 13 through the second input end of the first heat exchange unit 13 through the first output end, so that the raw water and the purified water are heat exchanged. In this process, the raw water temperature in the first heat exchange unit 13 increases and the purified water temperature decreases. At the same time, the second output end of the reverse osmosis unit 12 transports the concentrated water to the inside of the second heat exchange unit 14 through the first input end of the second heat exchange unit 14, and the second output end of the first heat exchange unit 13 transports the purified water to the second heat exchange unit 14 through the first output branch and the second input end of the second heat exchange unit 14. Heat exchange is carried out inside, during which the concentrated water temperature decreases and is then directly discharged through the first drain pipe. Then, the second output end of the second heat exchange unit 14 and the clean water inside the second branch enter the third heat exchange unit 15 through the second input end of the third heat exchange unit 15. The raw water from the first output end of the first heat exchange unit 13 enters the third heat exchange unit 15 through the first input end of the third heat exchange unit 15 for heat exchange. Then, the heated raw water enters the ultrafiltration unit 11 through the first output end of the third heat exchange unit 15. After ultrafiltration in the ultrafiltration unit 11, the raw water enters the reverse osmosis unit 12 for reverse osmosis process, thereby forming a water circulation system. At the same time, the clean water after cooling inside the third heat exchange unit 15 is directly supplied to users through the second drain pipe.

[0025] The input and output ends of the ultrafiltration unit 11, the reverse osmosis unit 12, the first heat exchange unit 13, the second heat exchange unit 14 and the third heat exchange unit 15 are all provided with pressure pumps, which facilitate better transmission of liquid when in use.

[0026] The first heat exchange unit 13 and the second heat exchange unit 14 are one or more of a plate heat exchanger, a tube heat exchanger, a spiral plate heat exchanger, a shell and tube heat exchanger, and a shell and tube heat exchanger. When in use, different styles of heat exchangers can be selected according to usage requirements.

[0027] The third heat exchange unit 15 is one or more of a coupler with antifreeze glycol added and a water source heat pump, or a coupler with antifreeze glycol added and an air source heat pump, which can be selected according to actual use.

[0028] The clean water flow Q2m at the second output end of the first heat exchange unit 13 3 / h is equal to the first output branch clean water flow Q1m 3 / h and the second output branch clean water flow Q3m 3 / h, the raw water flow Q at the output end of the ultrafiltration unit 11 is equal to the clean water flow Q2m at the first output end of the reverse osmosis unit 12 3 / h and concentrated water flow Q4m at the second output end 3 / h, the first output branch water flow Q1m 3 / h and the concentrated water flow Q4m at the first input end of the second heat exchange unit 14 3 / h is equal.

[0029] The raw water temperature T2°C at the first output end of the first heat exchange unit 13 is greater than the raw water temperature T1°C at the first input end of the first heat exchange unit 13, the raw water temperature T2°C at the first input end of the third heat exchange unit 15 is less than the raw water temperature T3°C at the input end of the ultrafiltration unit 11, the purified water temperature T5°C at the second input end of the first heat exchange unit 13 is less than the purified water temperature T5°C at the second output end of the first heat exchange unit 13, the purified water temperature T5°C at the second input end of the second heat exchange unit 14 is less than the purified water temperature T6°C at the second output end of the second heat exchange unit 14, the concentrated water temperature T4°C at the first input end of the second heat exchange unit 14 is less than the concentrated water temperature T9°C at the first output end of the second heat exchange unit 14, and the purified water temperature T7°C at the second input end of the third heat exchange unit 15 is greater than the purified water temperature T8°C at the output end of the third heat exchange unit 15.

[0030] The above embodiment discloses a constant temperature circulating water treatment system, wherein, when water needs to be treated, raw water is transported to the inside of the first heat exchange unit 13 through the first input end of the first heat exchange unit 13 through the preliminary treatment component, and the raw water is heated to T1°C by the heating component, and at the same time, the reverse osmosis unit 12 transports the clean water to the inside of the first heat exchange unit 13 through the second input end of the first heat exchange unit 13 through the first output end, so that the raw water and the clean water are heat exchanged. During this process, the raw water temperature in the first heat exchange unit 13 increases to T2°C and the clean water temperature decreases to T5°C, and at the same time, the second output end of the reverse osmosis unit 12 transports the concentrated water to the inside of the second heat exchange unit 14 through the first input end of the second heat exchange unit 14, and the second output end of the first heat exchange unit 13 transports the clean water through the first output branch and the second input end of the second heat exchange unit 14. The concentrated water is transported to the second heat exchange unit 14 for heat exchange. During this process, the concentrated water temperature is reduced to T9°C and then directly discharged through the first drain pipe. Then, the second output end of the second heat exchange unit 14 and the clean water in the second branch enter the third heat exchange unit 15 through the second input end of the third heat exchange unit 15. The raw water at the first output end of the first heat exchange unit 13 enters the third heat exchange unit 15 through the first input end of the third heat exchange unit 15 for heat exchange. Then, the raw water heated to T3°C enters the ultrafiltration unit 11 through the first output end of the third heat exchange unit 15. After ultrafiltration in the ultrafiltration unit 11, the raw water enters the reverse osmosis unit 12 for reverse osmosis process, thereby forming a water circulation system. At the same time, the clean water in the third heat exchange unit 15 after being cooled to T8°C is directly supplied to users through the second drain pipe.

[0031] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A constant temperature circulating water treatment system, comprising an ultrafiltration unit (11) and a first heat exchange unit (13), wherein the output end of the ultrafiltration unit (11) is connected to a reverse osmosis unit (12), and the reverse osmosis unit (12) is connected to two output ends, the output liquid inside the ultrafiltration unit (11) is raw water, the output liquid at the first output end of the reverse osmosis unit (12) is purified water, and the output liquid at the second output end of the reverse osmosis unit (12) is concentrated water, the ultrafiltration unit (11) is composed of a booster pump, a membrane shell, and an ultrafiltration membrane, and the reverse osmosis unit (12) is composed of a booster pump, a membrane shell, and a reverse osmosis membrane, characterized in that: The first input end of the first heat exchange unit (13) is connected to the output end of the preliminary treatment component, a heating component is connected between the output end of the preliminary treatment component and the first input end of the first heat exchange unit (13), the output liquid of the preliminary treatment component is raw water, the first output end of the first heat exchange unit (13) is connected to the output end of the ultrafiltration unit (11), the second input end of the first heat exchange unit (13) is connected to the first output end of the reverse osmosis unit (12), the second output end of the reverse osmosis unit (12) is connected to a first heat exchange mechanism for transferring and cooling the concentrated water temperature, and a second heat exchange mechanism for heating the raw water temperature inside the ultrafiltration unit (11) is provided between the output end of the ultrafiltration unit (11) and the first output end of the first heat exchange unit (13).

2. A constant temperature circulating water treatment system according to claim 1, characterized in that: The first heat exchange mechanism comprises a second heat exchange unit (14); the second output end of the reverse osmosis unit (12) is connected to the first input end of the second heat exchange unit (14); the first output end of the second heat exchange unit (14) is connected to a first liquid discharge pipe; the second output end of the first heat exchange unit (13) is connected to a first output branch and a second output branch; the first output branch is connected to the second input end of the second heat exchange unit (14).

3. A constant temperature circulating water treatment system according to claim 2, characterized in that: The second heat exchange mechanism comprises a third heat exchange unit (15), the first input end of the third heat exchange unit (15) is connected to the first output end of the first heat exchange unit (13), the first output end of the third heat exchange unit (15) is connected to the input end of the ultrafiltration unit (11), the second output end and the second output branch of the second heat exchange unit (14) are both connected to the second input end of the third heat exchange unit (15), and the second output end of the third heat exchange unit (15) is connected to a second liquid discharge pipe.

4. A constant temperature circulating water treatment system according to claim 3, characterized in that: The input ends and output ends of the ultrafiltration unit (11), the reverse osmosis unit (12), the first heat exchange unit (13), the second heat exchange unit (14) and the third heat exchange unit (15) are all provided with pressure pumps.

5. A constant temperature circulating water treatment system according to claim 3, characterized in that: The first heat exchange unit (13) and the second heat exchange unit (14) are one or more of a plate heat exchanger, a tube heat exchanger, a spiral plate heat exchanger, a shell and tube heat exchanger, and a shell and tube heat exchanger.

6. A constant temperature circulating water treatment system according to claim 3, characterized in that: The third heat exchange unit (15) is one or more of a coupler for adding antifreeze glycol and a water source heat pump, a coupler for adding antifreeze glycol and an air source heat pump.

7. A constant temperature circulating water treatment system according to claim 3, characterized in that: The clean water flow rate at the second output end of the first heat exchange unit (13) is equal to the sum of the clean water flow rate of the first output branch and the clean water flow rate of the second output branch; the raw water flow rate at the output end of the ultrafiltration unit (11) is equal to the sum of the clean water flow rate at the first output end of the reverse osmosis unit (12) and the concentrated water flow rate at the second output end; and the clean water flow rate of the first output branch is equal to the concentrated water flow rate at the first input end of the second heat exchange unit (14).

8. A constant temperature circulating water treatment system according to claim 3, characterized in that: The raw water temperature at the first output end of the first heat exchange unit (13) is greater than the raw water temperature at the first input end of the first heat exchange unit (13); the raw water temperature at the first input end of the third heat exchange unit (15) is less than the raw water temperature at the input end of the ultrafiltration unit (11); the purified water temperature at the second input end of the first heat exchange unit (13) is less than the purified water temperature at the second output end of the first heat exchange unit (13); the purified water temperature at the second input end of the second heat exchange unit (14) is less than the purified water temperature at the second output end of the second heat exchange unit (14); the concentrated water temperature at the first input end of the second heat exchange unit (14) is less than the concentrated water temperature at the first output end of the second heat exchange unit (14); and the purified water temperature at the second input end of the third heat exchange unit (15) is greater than the purified water temperature at the output end of the third heat exchange unit (15).

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